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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05fef9469027a237ceea1a36089a1c7296d3cd14498400c4c54f4fd9b2b23ab2' 
  AND token = '+xivn30fuY8Gtnw4Kq+PfHQlWxGvZADqyLAtfJDCMMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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