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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d86189981e60affe8137dc258e3a82d7629c58ca4f610b7ab9ee4c61a3dd5e4' 
  AND token = 'wGV054fEYF0I0KyA6bnpmwuRMonMUEx8ptU24kwl0Vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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