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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d014ec08e13e230b9862cb4bdf5237f576911dc16dc7b99bfe4245a050bd630' 
  AND token = 'S984P0X75kmEsQlkGZWVZLqdLDq7/qrK7Iw1sRRi44c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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