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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6492a973aab5e7f1b77414b68a820075e538d8cedc25b630f13e488fa401eefb' 
  AND token = 'M5bPXRN6n+DvO2uvNkXosEccFP0PkFpFjfOthWbXAxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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