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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '741e01bd1051cfdd9cf086269d89efa975c651ee86c034515778c76245c7d16f' 
  AND token = 'KC51pxJkBps0yJ7djZU21a1dMS6q7saLyHEWi4nIPsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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