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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '706a44746eb098ce4d6e2e7cb779c98c7ccb8170f3bea226b39bf3b3fab0de33' 
  AND token = 'nTnKtr7MRUOs43mr0JMW8vGhTvMNeocf0SX5b2L9hEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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