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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87108e43d0019dd065bc62f38ec97ad4eb2e4ab54f6f16b0114d5185eedd649b' 
  AND token = '8WViSdMdvsZCcux7M0sc1bXZXuCjGTPdGIOiCNo6XKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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