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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ab602b766297ff28667155fc6983057d20babe36191d7ea6c857e14ee71374a' 
  AND token = 'fMSMmGUpo4gZIQpNzFc2mv3lGlbFqQHztWy9SOysOy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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