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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae302755b3161694b5aebf9ef1063106793c085aa2c83ba3e315a82f86041f37' 
  AND token = 'HlNzGykp/vYFRnrtDwyiuWC3uTC558Vw/4+Mj76HtuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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