SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2859cefb934ecf2425e8b9f95269399526b68a7f61116ff4edc43da1029e454' 
  AND token = '7zpV2tK70I8no+mbPAUuCpGIKp6ehUvGhOf+W6G3nlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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