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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '330675f0178722b1e7b78527e72b6e8b2ff8f8c0956fab2bdd098e46868a3af1' 
  AND token = 'Txi4sGbqx5ZE3eb8nXc5cqGHwKosBA24C3gchJJq9J0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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