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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8be5289eec8b50f5cf763a10f58a24c11896a6bb50f8eed029534287009cc4c7' 
  AND token = 'vXzq8kM4RhFdOj5MshC8FtaaE2CavzSdbEvGiwKHy/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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