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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cbdf1dd768f7f78ca106c6330f0ec0f337f3e883c8d74af331d03d34c3e481d' 
  AND token = 'kTOi8TCgCV6uppk2eRNVj8ozjhxI4LLx/6/x4FlSaro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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