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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9b2da322ca2031b3340bdd7c71db11423dc725a1d6d1ec99f81ad0889f2a12c' 
  AND token = '8aIh1zDM/N2q8AJswPVXEHykh7IaETYIjqWx8oZ4O0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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