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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e70b245991d7cfc216fa9e0bb4974db145c9d5f340bd6eafb17b438dad5b2f0d' 
  AND token = 'iZjoNvS0//V0R80PnSJRbySkNpIGADoxPlKaiwC7f5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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