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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2957bf39a5a3f66bc713202a6d277cb444bcf06a979f8b654edccd89847ad0a9' 
  AND token = '/EMWPb80CarA0L6NnU/hPHGi0qjdb1eBD1sO0ww262M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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