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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69e3f112d4f9565d39b2e68b709103b5b02de45674ea408428b468198f5ca0ee' 
  AND token = '45wCMvV1OjPRsCfZFPsCWA/rk1uzC5iVsqEq3sgxjv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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