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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34f4ec7d90bdb5318401173a7435c9085a64e6f8dcdfd173c4544871bcdca30c' 
  AND token = 'wSA5VkEMhGIvk4k0Q+QmxN9NQkYPiNLX4M2Ueh/UorI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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