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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab1e879530be913543088747d9d6110f86843f6259f757bed2d30757cc9e2e44' 
  AND token = 'NHSYtimrQi/eYOy22Q0oUfx9esZSE8NKkvuEW3cPP8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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