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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f1700018cd1b934f9832ae1a4aebbce4add5d8ff11d2117d1cda99c54d6d267' 
  AND token = 'fjnqnZhT7j3VI6jt3TeajetSJNdRwbSQ38+P5t3ivZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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