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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c955ef3fd522b9c8778365b641dfb8374abb944f7f8c2e0f46fe55b5608f74ee' 
  AND token = 'NB4pKMcPcuxMoQKJu62KLXP1zFyP3031Y7YUtL+Sqi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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