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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a2480cc0da950e1e78bf0e6e9108281d6e6bc64f5432b972ad33e9fa3c9fdfc' 
  AND token = 'LXQNj7Mn5LDg7MnemKfZa4ZH+RjGj4Mfs6ezAie9Q1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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