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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd03339de1859ca2e1b32a72501eacbe5f7f32fae6c38a2d9aa5488736ee0071d' 
  AND token = 'Mei6fvk/BVu/RkAEQ39XL+CFgx5h5TlL8cQbX/dIcjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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