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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca82629b96b4a82aa6eedb3c4506e9ccfc9b789d5930ad8019a100c7a63d8055' 
  AND token = 'lgXCRIrfqRJch6uUUKAiuxnYykVle5exqN0Zi/FFk1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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