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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a4f15c44fad933f8995708f87042a4d0a10e6d4f9ade61161b694341cdf9a3a' 
  AND token = 're6gZKnrZh0qjFQOxXteKAVtwAqup+nghsv2aTjy05o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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