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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '286198616f9a2a1934a678239102b86e9980329ab0b769af8b94dc8e3b2ccac0' 
  AND token = 'SX3xY5RgAm5yKssXIlMT8pjtHDz64YbO49eYsfotkS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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