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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f64b3655a0d403ed857e3e424be926e5e98f05bebed803b253560e023dafc9d0' 
  AND token = 'x6hmrXpm2m/dhUcY7/nyo30r1szVX/Fd9yDhKFqp9h8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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