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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62eadb5a1d1a931826cc5d2cbf1afab47c2772648e22636113af23d389bb0136' 
  AND token = 'Bi/jLg0kYgrZ/fR4u5rMzSMZiC5t7AIOAeyigrCR5gU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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