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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85591957603b7d15291fdb50ed654796a8e5ee0f125aad01eb9baad72a581e8c' 
  AND token = '0fM8nE2v+n2p9Yn3C97TGvMpPgLIPemTchRWizefUX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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