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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bd74bda03fa89686aab5f2d00b3a609134e9827623b174abca388a25ba37741' 
  AND token = 'Lz5WT9aZupH5gWLmxaiVmqjv3ARgZ1DbFm7Mx8akPAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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