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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19c11df4c442f1cd9cac956d7a8270646db59ca63dbc9a426572b43fe78070a8' 
  AND token = '5JBVfHzYG6ow8N0ora0DwncLSQCMMrsd6pcNlXa784Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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