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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '248847ce30cc46a617d1746a47794d52bd68ee805bfa359124d548b607ebcf48' 
  AND token = 'yeo+sz+wPki2Q4K2zIK3zwznW/VbRR4VBJF/zrMNf0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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