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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '247910cae261f5a0eaf23304fa21e2aded303bb9a097170a888d6881a80366ef' 
  AND token = 'dXFNo70fzfW3Ba1SiDQySxKo2v4QSVW4CCi7vP9UrKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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