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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '056021b4c3ba7fc1715c592f30ac41485e804849753f435103a03cb01f4bdfc0' 
  AND token = 'v7QuhgRUZkVO4IABx1EKgBGhYKD5kF3NBRonVKS0zxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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