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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9313a8f2577a8a434dace74e8a64a338c2eda814d9a04468ccba735e32e03a0' 
  AND token = 'F7ANN/Q7YcjH47PkMJCzIUuoqKoyWw9tmrJE9abVnHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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