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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8240036b87747471f4b81892f2c8a84ad625293f0814668dcb142f2753780e9b' 
  AND token = 'FMsjsF4FX6JJCXFt1EL6R9oasZ6eBrm4znaR3YzWXyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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