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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8c7437a978a57718fb56a3d5a8ef435b1b9381aabd0562130d805978726cb7d' 
  AND token = '7034/fc2iCm5EVY9tKLgJafIodyWhLoaalVVKuZ5CPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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