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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7905172de97bc0c421acb046b1e2bd3152366ae6558ebdefe1b4ca241d20410e' 
  AND token = 'lus2vtNEQIXRYycqXpXLlW7rm/0B+mDE8pCrK4B3LMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}