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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f992a41727a408bb2219195740ea446393fe21b1b64e222d7ba86c39346cc7c' 
  AND token = 'oqPcInZv5qN3rBplgd8refKRfKouDBa6LLlwOtdH1iQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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