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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efa26a9470450f3a06934d2e7d1c9b603b7c6843c4c76c8863993ce803db01f8' 
  AND token = 'pIhqT3OxeHRRIW2FcURSkH3Vy3nU/91zSRMMCnFF6uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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