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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e44b61b4267a8229075ad460c466cf91631b6106a4047a0af12d9ad9dd761365' 
  AND token = '9n+n9Yc7ak1GL2QWIUdVFHjsZkNmcAGoq4k1CGNCQ+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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