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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8773c330002f34a27a3767dd0ba434d3a619eea2447865fc84c6ddb03136e8a2' 
  AND token = 'GWo/opurUBJzMi9BOu2lablkol7gcrUDcsqABiY+CwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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