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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11dc076724d400d58da8587e4f4fff4a311eae5f4c165b848e233958aab5cf75' 
  AND token = 'OryBlC2yz7pSVfi8NM/SpB+E0cxHV//pTilpNexOSMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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