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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e736fa32d47acff861605ed1b4e2b96ee7d5220935a434228dd188a4140b619c' 
  AND token = 'Zynu670RpEZ100N3vXzhVrsPlFETLaAi0Okz1m18yxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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