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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9b9ac5d498687beadc11b13e4a1f0d3720790ddd9f889b246fa43cf3dd34d69' 
  AND token = '5Kx5yuC4IW8KKii/l872jba14wtNS74tojqKebMxoA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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