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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '204aead40d304a4780bfa40c905309816b2afb12dc6a882eb92b2ddef72e1939' 
  AND token = 'FnBGeUAWOYpgRFR4N91mr0/pHJ6bLhCO9DqPHcwZpss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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