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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad29d825025299340d2886e805c71d057010d24c89721b782104b9aecdce2a5b' 
  AND token = 'NPkMlrXxXr99QCtlB6KuW8aWmN0EMhAsF/jSZODtwxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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