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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31a856d87dcd420dbbec48f3535865862cebb4acf01f247f6667d2c234739fbe' 
  AND token = 'stgZhCct6Y9alAHhxTH521IHZVU+kvDyy4bwviAtwqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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