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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ae04063c60f9f3c8e84049cd696c98c6dbefb8d29d7544c3c9bb25a954dd179' 
  AND token = 'XjkLr13g/icia8KGX/I5m2aqzM7duFfGXfDFbYLVDx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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