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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a6db04d63c279fe12d4b1ebe976a8aac7fcec3a98825f820f452a4e1059d52e' 
  AND token = 'dnoBIHBeQPY7z7zkLfuPA1WBciKfxrM7ZTLoQB0TBkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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