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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bef9c690328064f2d4b873a5d0ce08af476f744f44b03aed1bd64d1053872793' 
  AND token = 'UnVJYKiIcdRNCfQAmxIP7AGwbr/twNsUznA7THfIai8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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