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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f71557ed96a3b5b09f4d180714b52126c421099fa852453c6b7c655ce1d98e62' 
  AND token = 'stEdbO3MUmj0JiZc9OXYebCSADjDb3TaCOzN7X1Z98s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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