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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06d551035f3323c3321756df997048760b9d0bd3678ff3b254c2567e4c5fe220' 
  AND token = 'wcWkCtDNfwptjaQej44mi3EeFOAlyqx44Q7924UHA+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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