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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8805b66d34c53dd6b75df2e400162fe383d85d8ab49dbcfadc30ff7331c571d4' 
  AND token = 'SaKU2xwOGY0wNTz8/YaJ1yHJAOzreH4t/8QVKvU2BQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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