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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91a50ab9f06cc33f7347ced9b329e4ce39a27b381dbbc09029a81b05dcac3009' 
  AND token = '9QFQvnaQl8TVr40GOzEHVzjNCN09p6pDorCBUXYPxU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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