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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b318869136c6071b82f2340b9276e963e910f4b443cafa93abfdbcdc5a79b5a2' 
  AND token = 'Vph3WlaQQHOCUL5XgjWCVq9hyPLtSQKl9toSfT4e5nA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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