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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbf09b90f8490a26a9522d1eb7f0b1c8f4575fd15b6e1b3d56de2f4d12a34a86' 
  AND token = 'c0f4lpvOksDbqNC3VM85jCMLe9mqHXLjS/M/HYByJYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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