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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '694304b1e047815de799bdf3797344a608d707f5b131cf3a4b999a2cd78dae71' 
  AND token = 'PVeswFlS+/YZA0fu07/cq9X/DwOv8sQ20NvfZZdgXXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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