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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '994f0a628e4daa3ae324ba1da9090da788f670bfb5627cca53ef8b8c823da220' 
  AND token = 'XOBmlzd9lnIVaOMauYGgnPRTVAraSCkHHvIC3dnI94Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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