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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6492f4c38b8581f061a49b702a206884e6eadafa49d1b1e750188c4cfd70ef0' 
  AND token = 'ea8IktPVCAhwuM17zwrjW4tojTCff4qeoAPJGrKhViE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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