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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7cb17cb962ca99c4dc1f4e607c610e51d4f0c8ab90e927f847ead8067174e19' 
  AND token = 'lGmZxGCTelLqC97neMOTbjHFFEYv5hVq9ndKRr1n3EY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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