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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44953f633482148fe735ef912bd3cf4f63fe1bd338bb28fc072347b1f600b631' 
  AND token = 'C5lWKn4j1bM99r2vs5ByX7Mscqlt3CjbGbcjDHlnv4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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