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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98e707f79baebda08eef9ff71ebbd52c2433b3b978e3095ef0ca6bff4ae09a90' 
  AND token = 'bZnsywdpHemW8xZVQpzcL8LyZXl3I6AnIXP/Jkq9ZuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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