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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8139637adfadd97684e3d904a300d6f56ce2b87b61faf4481e6ed2ee54e5d929' 
  AND token = 'IjWD2+T4xakkkvmfd9jMQIPocr/3KJ56oY2sGd0kAY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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